80 lines
2.2 KiB
Go
80 lines
2.2 KiB
Go
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package core
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import (
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"encoding/binary"
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"fmt"
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"os"
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)
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// BMPFileHeader represents the bitmap file header structure.
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type BMPFileHeader struct {
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FileType [2]byte
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FileSize uint32
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Reserved1 uint16
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Reserved2 uint16
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DataOffset uint32
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}
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// BMPInfoHeader represents the bitmap info header structure.
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type BMPInfoHeader struct {
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Size uint32
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Width int32
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Height int32
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Planes uint16
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BitsPerPixel uint16
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Compression uint32
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SizeImage uint32
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XPelsPerMeter int32
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YPelsPerMeter int32
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ColorsUsed uint32
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ColorsImportant uint32
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}
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func readBmpInfo(filePath string) (error, int32, int32) {
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file, err := os.Open(filePath)
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if err != nil {
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fmt.Printf("=== Failed to open file: %v\n", err)
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return err, 0, 0
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}
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defer file.Close()
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// Read the file header.
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var fileHeader BMPFileHeader
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if err := binary.Read(file, binary.LittleEndian, &fileHeader); err != nil {
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fmt.Printf("=== Failed to Read file: %v\n", err)
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return err, 0, 0
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}
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// Check if it's a valid BMP file by verifying the file type.
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if string(fileHeader.FileType[:]) != "BM" {
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fmt.Printf("=== Not a valid BMP file: %v\n", err)
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return err, 0, 0
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}
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// Read the info header.
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var infoHeader BMPInfoHeader
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if err := binary.Read(file, binary.LittleEndian, &infoHeader); err != nil {
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fmt.Printf("=== Failed to Read file: %v\n", err)
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return err, 0, 0
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}
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return err, infoHeader.Width, infoHeader.Height
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//fmt.Printf("=== File size: %d bytes\n", fileHeader.FileSize)
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//fmt.Printf("=== Image dimensions: %dx%d\n", )
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//fmt.Printf("=== Bits per pixel: %d\n", infoHeader.BitsPerPixel)
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// At this point, you would typically read the pixel data into a slice,
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// taking into account any padding required for alignment and the specific
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// pixel format (e.g., RGB, RGBA, indexed color). This part is omitted here.
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// You may also need to skip over a possible color palette if present.
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// The size of the palette can be inferred from the number of colors used and
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// the bits per pixel value.
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// For simplicity, we'll just read the rest of the file as raw bytes.
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//data, err := ioutil.ReadAll(file)
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//if err != nil {
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// panic(err)
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//}
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//fmt.Printf("=== Read %d bytes of pixel data.\n", len(data))
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}
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